Sash windows in the 20th century

Timber sash windows have long been a hallmark of British architectural elegance. While their exact origins are debated—some suggest they were first seen in 18th-century Holland—recent studies point to their invention in the UK as early as the 17th century. Whatever their birthplace, sash windows have become an iconic feature of period homes across Britain.

Throughout the 20th century, sash windows evolved with the times. In the 1920s and 30s, traditional cords were replaced by chains, previously reserved for public buildings like libraries and post offices. This shift reflected the growing accessibility of stronger materials and the rise of domestic innovation.

However, during the Second World War, steel shortages and rising costs led to a decline in sash window installations. Mass-produced alternatives took their place, not due to style preferences, but out of necessity. The trend continued into the 1950s and 60s, as modernism reshaped the housing landscape.

By the 1980s and 90s, homeowners began to rediscover the charm and durability of well-made timber sash windows. Restoration projects flourished, breathing new life into period properties. Modern sash windows emerged, combining traditional aesthetics with double glazing and energy-efficient performance—a perfect blend of heritage and sustainability.

Today, in the 21st century, wooden sash windows are once again celebrated. From Georgian townhouses to contemporary new builds, they offer timeless style, lasting value, and environmental responsibility.

At The Sash Window Workshop, we specialise in the manufacture, installation and repair of timber sash windows. With decades of experience, we serve homeowners across London and Southern England, including those in listed buildings and conservation areas. Our team combines traditional craftsmanship with modern standards, ensuring every window enhances your home’s character and comfort.